public void Parse()
{
while(true)
{
switch (_parser.Parse())
{
case ParseMessage.Empty:
break;
case ParseMessage.TokenRead:
_parser.TokenSyntaxNode = _context.GetTokenText();
break;
case ParseMessage.Reduction:
_parser.TokenSyntaxNode = _context.ExecuteReductionRule();
break;
case ParseMessage.Accept:
Program = (GlifStatement)_parser.TokenSyntaxNode;
return;
case ParseMessage.LexicalError:
throw new InvalidDataException("LEXICAL ERROR. Line " + _parser.LineNumber + ". Cannot recognize token: " + _parser.TokenText);
case ParseMessage.SyntaxError:
var text = new StringBuilder();
foreach (Symbol tokenSymbol in _parser.GetExpectedTokens())
{
text.Append(' ');
text.Append(tokenSymbol.ToString());
}
throw new InvalidDataException("SYNTAX ERROR. Line " + _parser.LineNumber + ". Expecting:" + text);
case ParseMessage.InternalError:
throw new InvalidOperationException("INTERNAL ERROR! Something is horribly wrong");
case ParseMessage.NotLoadedError:
throw new InvalidDataException("NOT LOADED ERROR! Compiled Grammar Table not loaded");
case ParseMessage.CommentError:
throw new InvalidDataException("COMMENT ERROR! Unexpected end of file");
case ParseMessage.CommentBlockRead:
break;
case ParseMessage.CommentLineRead:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
}
public GlifStatementList(GlifContext context, GlifStatement currentStatement, GlifStatement nextStatement)
: base(context)
{
_current = currentStatement;
_next = nextStatement;
}